16. From what I've heard

Who was actually yelling on the tape isn't exactly clear. FWIW, the police played the tape for Trayvon's father and he apparently said it wasn't his son who was crying out. That's not proof and it doesn't really change anything, of course. Which one of them was yelling doesn't matter at all. And it's also possible that Trayvon's father is mistaken and that the cries really were his son.